Search Publications
The in-flight monitoring and validation of the SOHO CDS Normal Incidence Spectrometer radiometric calibration
Lanzafame, A. C.; Brooks, D. H.; Thompson, W. T. +3 more
The scientific return from an extreme-ultraviolet spectrometer depends on the accuracy and precision of its radiometric calibration. For the Coronal Diagnostic Spectrometer on SOHO, radiometric calibration started pre-launch in the laboratory and continued after launch by making comparison measurements of the same area of the Sun with calibrated s…
The relationship between inductive electric field and flares
Liu, J. H.; Zhang, H. Q.
We observationally deduce the inductive electric field in the photosphere for the first time from the horizontal velocities computed by local correlation tracking (LCT) technique and the vector magnetic fields derived from vector magnetograms. We study the relationship between E and powerful flares (X-class) of four active regions (ARs): NOAA 1072…
Thin magnetic hydrogen atmospheres and the neutron star RX J1856.5–3754
Ho, Wynn C. G.; Kaplan, David L.; Chang, Philip +2 more
RX J1856.5–3754 is one of the brightest nearby isolated neutron stars, and considerable observational resources have been devoted to it. However, current models are unable to satisfactorily explain the data. We show that our latest models of a thin, magnetic, partially ionized hydrogen atmosphere on top of a condensed surface can fit the entire sp…
Subaru Near-Infrared Multicolor Images of Class II Young Stellar Object, RNO 91
Tamura, Motohide; Hayashi, Masahiko; Kudo, Tomoyuki +6 more
We conducted subarcsecond near-infrared imaging observations of RNO 91 with CIAO (Coronagraphic Imager with Adaptive Optics) mounted on the 8.2m Subaru telescope. We present our JHK band data along with optical images, which when considered together reveal a complex circumstellar structure. We examined the colors of associated nebulae and compared…
Cluster observations of shock-turbulence interactions
Glassmeier, Karl-Heinz; Goldstein, Melvyn L.; Narita, Yasuhito +1 more
Measurements of wave number spectra for two-dimensional, Alfvénic, and compressible fluctuations are presented in the solar wind and the regions related to the collisionless shocks. The spectra are determined from the four-point magnetometer data recorded by the Cluster spacecraft. The solar wind exhibits spectral curves characteristic of the iner…
Cassini Cosmic Dust Analyser: Composition of Dust at Saturn
Kempf, S.; Postberg, F.; Srama, R. +6 more
We discuss issues involved with interpreting time-of-flight mass spectra (TOFMS) obtained by the Chemical Analyser subsystem of the Cassini Cosmic Dust Analyser (CDA). We use an in-house ion dynamics code specifically written for CDA which helps us to understand and constrain the initial impact plasma ion kinetic energy and angular distributions. …
Titan atmosphere profiles from Huygens engineering (temperature and acceleration) sensors
Lorenz, Ralph D.
Data from several Huygens probe housekeeping sensors (an engineering accelerometer and housekeeping temperature sensors) are studied to determine how effectively such nonideal instruments may characterize the density or temperature structure of the atmosphere. While only confirming the results of the dedicated atmospheric structure instrument, thi…
The inner structure of the S0 galaxy NGC 3384
Meusinger, H.; Ismail, H. A.
We re-investigate the lenticular galaxy NGC 3384, a member of the Leo I galaxy group, using HST and multi-colour Calar Alto observations. Various approaches are used to visualize the two known peculiar components, the so-called inner component (IC) and the elongated component (EC), on the HST images. The methods were checked in detail using synthe…
ISOCAM mid-infrared spectroscopy and NIR photometry of the HII complex N4 in the Large Magellanic Cloud
Boulanger, F.; Sauvage, M.; Contursi, A. +3 more
Context: We present the analysis of ISOCAM-CVF and the J, H, and Ks photometry data for the HII region complex N4 in the Large Magellanic Cloud (LMC).
Aims: The aim is twofold: 1) to study the connection between the interstellar medium and the star content of this region; 2) to investigate the effects of the lower-than-Galactic meta…
Relative fluxes of shock and prompt peaks in SEP event time profiles
Luhmann, J. G.; Mann, Adam
Peak fluxes are an important property of gradual solar energetic particle (SEP) event time profiles from both astro/heliophysical and applications perspectives. However, the peak flux in an event may occur at the event onset, or at the time of the interplanetary shock arrival (the ESP or energetic storm particles). This makes an important differen…